Londyn Silzer

When the bodies of two serial killers are found on Five-0 property with chess pieces in their mouths, McGarrett and the team hunt for a vigilante as fear grows that tourists aren't safe in Hawaii. Rosalind Chao guest stars as Governor Keiko Mahoe.

Five-0 must work with rogue MI-6 agent Harry Langford (guest star Chris Vance) to find a terrorist planning to cause nuclear reactors across Europe to meltdown. Also, McGarrett and Danny ask retired FBI profiler Alicia Brown (guest star Claire Forlani) to help them find their serial killer vigilante.

While Danny chaperones Grace’s winter formal, terrorists seize the venue and hold everyone hostage in order to kidnap a diplomat’s son.

When a woman is murdered in her home, Five-0 learns that one of their own has a deep connection to the victim's young daughter. Elliott Gould guest stars.

McGarrett risks his life when Five-0 attempts their most dangerous rescue yet of young girls trapped in the sex trafficking ring they have been tracking this year. Also, Kono, deeply affected by the case, makes a life-changing decision, on the seventh season finale.